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A kind of refractory material for the end cover of centrifugal large bar roll and the manufacturing method of the end cover

A manufacturing method and roll technology, which is applied in the field of refractory materials for the end caps of centrifugal large bar rolls, can solve the problems of insufficient high temperature resistance strength and thermal shock resistance, insufficient adhesion between the refractory cement layer and the end cap, and easy occurrence of refractory cement layers Wear and other problems, to achieve the effect of good thermal shock stability, small expansion coefficient, and good bonding performance

Active Publication Date: 2020-07-24
成都三强轧辊股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of refractory cement layer has the defects of poor strength and low refractoriness. During the production process of centrifugal large bar rolls, the temperature of the molten metal generally reaches a high temperature above 1200°C. The high-speed rotation under the ground makes the refractory cement layer prone to wear and thermal fatigue, the high temperature resistance strength and thermal shock resistance are not enough, and the adhesion between the refractory cement layer and the end cover is not enough, the refractory cement layer is easily impacted by the high temperature molten metal After falling off, the end cover molding sand is easily damaged, and the internal molten metal is easy to overflow, causing safety hazards, and causing the problem of slag inclusion in the roll composite area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A refractory material for the end cover of a centrifugal large-scale bar roll, comprising the following components in terms of mass percentage: 25% bauxite, 10% zircon powder, 15% high alumina cement, 40% silica powder, and 10% water %; wherein, the bauxite is composed of the following component proportions: the bauxite with a particle size of 3-8mm accounts for 10%, and the bauxite with a particle size of 1-3mm accounts for 15%; the particle size of the zircon powder 100-150 mesh, and the particle size of the silica powder is 10-15 μm.

[0024] The manufacturing method of the roll end cover with the above-mentioned refractory material is as follows:

[0025] (1) First, add 30% of total water to bauxite with a particle size of 3-8mm and water at a temperature of 55°C to make slurry, and then spread the slurry evenly on the surface of the roll end cover to check the surface smoothness, so that no Flatness≤5mm;

[0026] (2) Fully mix zircon powder, silica powder and hig...

Embodiment 2

[0032]A refractory material for the end cover of a centrifugal large-scale bar roll, comprising the following components in terms of mass percentage: 35% of bauxite, 8% of zircon powder, 12% of high alumina cement, 45% of silica powder, and 5% of water %; wherein, the bauxite is composed of the following component proportions: the bauxite with a particle size of 3-8mm accounts for 15%, and the bauxite with a particle size of 1-3mm accounts for 20%; the particle size of the zircon powder 100-150 mesh, and the particle size of the silica powder is 10-15 μm.

[0033] The manufacturing method of the roll end cover with the above-mentioned refractory material is as follows:

[0034] (1) First, add 40% of the total water to the bauxite with a particle size of 3-8mm and water at a temperature of 60°C to make slurry, and then spread the slurry evenly on the surface of the roll end cover to check the surface smoothness, so that no Flatness≤5mm;

[0035] (2) Fully mix zircon powder, s...

Embodiment 3

[0041] A refractory material for the end cover of a centrifugal large-scale bar roll, comprising the following components by mass percentage: 30% of bauxite, 10% of zircon powder, 14% of high alumina cement, 38% of silica powder, and 8% of water %; wherein, the bauxite is composed of the following component proportions: the bauxite with a particle size of 3-8mm accounts for 12%, and the bauxite with a particle size of 1-3mm accounts for 18%; the particle size of the zircon powder 100-150 mesh, and the particle size of the silica powder is 10-15 μm.

[0042] The manufacturing method of the roll end cover with the above-mentioned refractory material is as follows:

[0043] (1) Add 35% total water and 58°C water to the bauxite with a particle size of 3-8mm to make slurry, and then spread the slurry evenly on the surface of the roll end cover to check the surface evenness. Flatness≤5mm;

[0044] (2) Fully mix zircon powder, silica powder and high alumina cement, add water with a...

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PUM

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Abstract

The invention provides a refractory material for a large centrifugal bar roll end cover and a manufacturing method of the end cover containing the refractory material. The refractory material is prepared from components in percentage by mass as follows: 25%-35% of bauxite, 8%-10% of zircon powder, 12%-15% of high-alumina cement, 35%-45% of silica powder and 5%-10% of water, wherein the bauxite comprises components in percentage as follows: 10%-15% of bauxite with the granularity being 3-8 mm and 15%-25% of bauxite with the granularity being 1-3 mm. The refractory material for the roll end cover has the characteristics of high strength and refractoriness, has good adhesion force with the end cover and cannot easily fall off when a large centrifugal bar roll is poured, the end cover cannot be damaged, molten iron cannot leak out, the problem of slag inclusion in the roll compositing area is effectively solved, and the production safety and the product quality are well guaranteed.

Description

technical field [0001] The invention belongs to the technical field of centrifugal rolls, and in particular relates to a refractory material for an end cover of a centrifugal large bar roll and a method for manufacturing the end cover. Background technique [0002] Roll is an important metallurgical equipment in steel rolling production, and it is also one of the main consumption equipment. The consumption of roll is about 5-15% of the production cost of steel rolling. In order to improve the quality of rolls and reduce the production cost of rolls, existing domestic and foreign roll companies generally adopt centrifugal casting to produce rolls. The quality of the roll is not only related to the production cost of steel rolling and the production efficiency of the rolling mill, but also affects the quality of the rolled material to a large extent. With the continuous development of roll production technology, the wear resistance, strength and toughness of existing rolls ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66B22D13/10
CPCB22D13/101C04B35/66C04B2235/3217C04B2235/3244C04B2235/3418
Inventor 付家双杨德明程东
Owner 成都三强轧辊股份有限公司
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